PROCESS FOR PRODUCING THERMOPLASTIC RESIN FOAM FILM AND THERMOPLASTIC RESIN FOAM FILM
Disclosed is a process for producing a thermoplastic resin foam film that can produce a thin thermoplastic resin foam film. The process comprises the step of cutting a thermoplastic resin foam. The process is characterized in that, in the step of cutting the thermoplastic resin foam, at least one of the thermoplastic resin foam and a blade is reciprocated, and, when at least one of the thermoplastic resin foam and the blade is reciprocated, and the thermoplastic resin foam and the blade are slid in the movement of the foam or the blade on at least one of the advancement path and the return path of the reciprocation movement, whereby the thermoplastic resin foam is intermittently cut.
1 . A process for producing a thermoplastic resin foam film, having a step of cutting a thermoplastic resin foam, characterized in that, in the step of cutting a thermoplastic resin foam, the thermoplastic resin foam is cut intermittently, as at least one of the thermoplastic resin foam and a blade is moved reciprocally and the thermoplastic resin foam and the blade are brought into contact with each other at least in the path of forward or backward movement.
2 . The process for producing a thermoplastic resin foam film according to claim 1 , wherein, in the step of cutting a thermoplastic resin foam, a thermoplastic resin foam having a certain thickness is cut, as the thermoplastic resin foam is fed by a certain thickness and the thermoplastic resin foam and the blade are brought into contact with each other at least in the path of forward or backward movement.
3 . The process for producing a thermoplastic resin foam film according to claim 1 , wherein the thermoplastic resin foam is cut into a thin film and the thin film is further flattened, as it is heated to a temperature in the range of the thermoplastic resin glass transition temperature −30° C. or higher and the glass transition temperature or less.
4 . A thermoplastic resin foam film, having a density of 100 kg/m 3 or more and 500 kg/m 3 or less, a thickness of 0.1 mm or more and 1.0 mm or less and, a compressive strength at 10% compression of 0.8 MPa or more.
5 . The thermoplastic resin foam film according to claim 4 , having a thickness of 0.1 mm or more and 0.4 mm or less.
6 . The thermoplastic resin foam film according to claim 4 , wherein the glass transition temperature of the thermoplastic resin is 105° C. or higher.
7 . The thermoplastic resin foam film according to claim 4 , wherein the thermoplastic resin is a styrenic resin.
8 . A laminate foam film, comprising the thermoplastic resin foam film according to claim 4 and an aluminum foil laminated at least on one face thereof.